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  • Title: Carbapenemase-producing Pseudomonas aeruginosa in Spain: interregional dissemination of the high-risk clones ST175 and ST244 carrying blaVIM-2, blaVIM-1, blaIMP-8, blaVIM-20 and blaKPC-2.
    Author: PÉrez-VÁzquez M, Sola-Campoy PJ, Zurita ÁM, Ávila A, GÓmez-Bertomeu F, SolÍs S, LÓpez-Urrutia L, GÓnzalez-BarberÁ EM, Cercenado E, Bautista V, Lara N, Aracil B, Oliver A, Campos J, Oteo-Iglesias J, Spanish Antibiotic Resistance Surveillance Program collaborating Group.
    Journal: Int J Antimicrob Agents; 2020 Jul; 56(1):106026. PubMed ID: 32450200.
    Abstract:
    Carbapenemase-producing (CP) Pseudomonas aeruginosa is rare compared with mutation-driven carbapenem-resistance, but this situation may be changing. A collection of CP P. aeruginosa isolates was characterized in this study. In 2016, 232 unduplicated carbapenem-resistant P. aeruginosa isolates, of which 71 (30.6%) carried carbapenemase genes, were submitted to the Spanish antibiotic reference laboratory and were further analysed by whole-genome sequencing (WGS). Of the 71 CP P. aeruginosa, 39 (54.9%) carried blaVIM-2, 14 (19.7%) blaVIM-1, 8 (11.3%) blaIMP-8, 6 (8.5%) blaVIM-20, 2 (2.8%) blaVIM-2 plus blaKPC-2, one (1.4%) blaIMP-13 and one (1.4%) blaVIM-1 plus blaIMP-18. Four sequence types (ST175, ST244, ST815 and ST155) encompassed 83.1% of the 71 CP P. aeruginosa; ST175 was detected in hospitals from seven provinces. Using core genome multilocus sequence typing (cgMLST), four clusters were detected: Cluster 1 included nine ST815/VIM-2 isolates; Cluster 2 included five ST175/VIM-2 isolates; Cluster 3 included seven ST244 isolates (five VIM-2 and two VIM-2 plus KPC-2); and Cluster 4 included 11 ST175 isolates (seven VIM-2 and four IMP-8). The average number of acquired resistance genes was significantly higher in the blaVIM-1-carying isolates (7.1 ± 0.94) than in the blaVIM-2-carrying isolates (4.5 ± 0.20). CP P. aeruginosa isolates are spreading in Spain, mainly due to the dissemination of high-risk clones such as ST175 and ST244 producing VIM and IMP carbapenemases. Emergence of CP P. aeruginosa is a cause of clinical and epidemiological concern.
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